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Manchester United midfielder Jesse Lingard posted this video on Snapchat during the incident.

West Ham, who are moving to the Olympic Stadium next year after 112 years at Upton Park, initially downplayed the incident.

But a statement released on Wednesday morning said: "We are aware that there were some supporters outside the Boleyn Ground who didn't act in an appropriate way when the Manchester United team bus was damaged.

"That was not acceptable and we will work with the police to identify those responsible and ban them for life."

Speaking last night to Radio 5 Live, West Ham co-chair David Sullivan said: "I don't understand why United couldn't get here at 4pm. They could have got here early. They knew it would be busy. It's crazy.

"There was congestion in the street and they couldn't get the coach in. There were people around the coach, but there was no attack on the coach."